JPS62202486A - Insulator for heater assembly of warm wind generator - Google Patents

Abstract

(57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.

Description

DETAILED DESCRIPTION OF THE INVENTION (Field of Industrial Application) The present invention relates to an insulator for a heater assembly of a hot air generator. The hot air generator is used for drying paint, melting and adhering flooring materials, heating heat-shrinkable tubes or films, and the present invention can be applied to handheld or fixed types.

(Prior Art) Conventionally, a coiled heating wire is wound around a bar-shaped insulator having a cross-shaped cross section.

(Problems to be solved by the invention) In the conventional insulator, there is a problem that the rod-shaped insulator breaks in the middle due to temperature changes in the heating wire, and in order to prevent breakage, a homogeneous insulator is required, which is expensive. Ta.

(Means for Solving the Problems) The present invention is a heater insulator made by stacking a plurality of heater insulators, and the heater insulator has a core disposed at the center of an annular outer periphery. and the annular outer peripheral portion are connected by a connecting portion. Then, between the connecting parts of the opposing heater insulators, a spiral space is provided, and a heating element is placed in this space, or a heating element is placed in the space between the outer periphery and the core. Insert repeatedly back and forth in the axial direction. When forming a spiral cavity, it is formed by forming a recess in the axial end face of the connecting part or by reducing the axial height of the connecting part itself. Then, the axial height of the connecting part of the heater insulator alone is gradually increased in the circumferential direction on one side,
On the other side, the heater insulators made in this manner are stacked one on top of the other, with the heater insulators being made lower in the circumferential direction. A heating element is interposed between the connecting portions of the opposing heater insulators.

(Function) Since the insulator for the heater assembly is made by stacking a plurality of individual heater insulators, it will not break even if there is a temperature change or mechanical shock. The annular outer periphery of the single heater insulator insulates the outer periphery of the heating element and also reinforces the connecting part. By making the height gradually lower in the direction, the heating element can be wound in a spiral shape. Then, this spirally wound heating element is inserted into a hollow space provided between the connecting portions of opposing single heater insulators.

(Example) Next, an example will be described along with the drawings. In Figure 1, 1
2 is a handheld hot air generator body, 2 is a grip part of the hot air generator body 1, 3 is a motor built into the rear of the main body 1, and 4 is installed in the grip part 2 to switch between hot air, cold air, and OFF. Switch, 5 is a fan fixed to the shaft of motor 2, 7
is an air straightener that guides the wind forward; 8 is an insulator for a heater assembly that warms the air guided forward from the air straightener 7; 9 is a holding cylinder that holds the insulator 8 for the heater assembly; and 10 is a surrounding area of the holding cylinder 9. It is a net-like protective tube.

The heater assembly insulator 8 is made up of a plurality of heater insulators 11 of the same shape stacked one on top of the other, with a coiled heating element 12 interposed therebetween (FIG. 2). The heater insulator unit 11 is made of ceramic, and a core part 14 is arranged at the center of an outer peripheral part 13 of a toric body, and the core part 14 and the outer peripheral part 13 are connected by connecting parts 15 at equal intervals in the circumferential direction. .

The connecting portions 15 are formed in several places, and each connecting portion 15
A concave portion 16 having an arcuate shape is formed at both ends in the axial direction. The connecting portion 15 is disposed between the outer peripheral portion 13 and the core portion 14 so that the position in the axial direction is shifted little by little. This point will be explained with reference to FIG. 3 and FIGS. 4 to 7. In the illustrated example, the connecting portions 15 are formed at eight locations, and these are referred to as first connecting portions 151 to eighth connecting portions 158.

The first connecting portion 151 is formed so as to protrude most on one surface of the heater insulator and to be recessed most deeply on the other surface. The second connecting portion 152 has a slightly smaller protrusion on one surface, and a slightly shallower recess on the other surface. In this way, the third to seventh connecting parts 153 to 157
are formed sequentially from one side to the other,
The eighth connecting portion 158 has a protrusion amount and a recess amount opposite to those of the first connecting portion 151, and the heating element 12 placed on the eighth connecting portion 158 enters under the first connecting portion 151 in a spiral shape.

In this way, the heater insulator units 11 are stacked one on top of the other, and the heating element is pulled out from one side to the other side through the space between the first connecting part 151 and the eighth connecting part 158, and the first stage heater insulator unit In the same manner as above, wind the wires sequentially from the first connecting portion to the eighth connecting portion.

At this time, the recess 16a on the upper surface side of the connecting portion 15 of the single heater insulator in the first stage and the recess 16b on the lower surface side of the connecting portion 15 of the single heater insulator in the second stage are equal to the outer diameter of the heating element 12. A hole of a size suitable for holding the heating element 12 is formed by making the hole slightly larger. One end 17 of the heating element 12 wound in a spiral in this manner is connected to a power source, and the other end 18 is connected to the switch 4 through a through hole 19 penetrated through the heater insulator unit 11. 20 is a mark for aligning the position of the heater insulator unit 11, 21 is a positioning recess, and 22 is a positioning recess that engages with the positioning recess. 23 is a dropper resistor for setting the voltage of the motor to a predetermined voltage, and is inserted into a bolt 24 passing through the stacked heater insulator unit 11, and is held down with a stopper 25 and tightened with a nut 26. Nando 26
It is preferable that the bolt be double-Nanded to prevent loosening due to thermal expansion of the bolt. The stopper 25 is fixed to the holder M9 with a screw 27.

Reference numeral 28 denotes a wind regulating plate that prevents the red-hot heating element 12 from being seen from the outside and narrows the flow area to increase the wind speed.

In the above embodiment, the heater insulator is shifted in the axial direction by one stage each time the heating element is rotated once, but it is shifted by one stage of the heater insulator every half or one-third of a revolution. Good too.

<Effects of the Invention> As described above, the present invention provides a single heater insulator having an annular outer periphery, a core disposed at the center of the annular outer periphery, and connecting parts connecting the annular outer periphery and the core at several locations. Since a plurality of heater insulators are stacked one on top of the other, there is no risk of the heater insulator breaking due to temperature changes in the heating element, and the insulation is reliable.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a hot air generator to which an embodiment of the present invention is applied, FIG. 2 is a perspective view of the embodiment, FIG. 3 is a plan view of the heater insulator alone, and FIGS. 7 shows the end face in FIG. 3, FIG. 4 is a cross-sectional end view taken along the line IV-■, FIG. 5 is a cross-sectional end view taken along the line V-V, FIG. 6 is a cross-sectional end view taken along the line VI-VI, and FIG. It is a sectional end view taken along the line ■-■. 8... Insulator for heater assembly, 11... Heater insulator alone, 12... Heating element, 13... Outer periphery, 1
4... Core part, 15... Connecting part

Claims (2)

[Claims] (1) A plurality of heater insulators each having an annular outer periphery, a core disposed at the center of the annular outer periphery, and connecting parts connecting the annular outer periphery and the core at several locations are stacked together. Features: Insulators for heater assemblies of hot air generators. (2) The insulator for a heater assembly of a hot air generator as set forth in claim 1, wherein a spirally connected hollow space is formed between the connecting portions of opposing single heater insulators.